Agriculture Reference
In-Depth Information
inoculated with Azotobacter and Azospirillum in conjunction with 60 kg N ha -1 (50% N of the
standard dose) and 100 ppm GA 3. In our comparative study, a wide variability in productivity
can also be observed among the tested cultivars. 'Clery' has been shown as the superior
cultivar in terms of the generative potential including the highest fruit number and yield per
plant obtained (36.2 and 0.78 kg, respectively).
Our results indicate that 'Clery' yielded much better than in the study reported by
Milivojević et al. (2009), who found a 1.5 times lower productivity for this cultivar grown in
bags filled with 15 l of BVB HAASNOOT substrate. An increase of the generative potential
observed in our study can be explained by the lower planting density and application of
fertilizers. In particular, the biofertilizer treatment induced a slightly higher yield per plant
which was probably attributed to the higher solubility and easy availability of inorganic
components in such conditions.
In hydroponics production system general advantages are based on the ability to control
water and nutrient management inside greenhouse. Conversely, traditional measures
performed in the field strawberry production inadequately assess the roles of the microbial
community structure and genetic diversity in the soil ecosystem processes that have a direct
impact on the soil quality and indirectly influence plant growth and productivity. Therefore,
different yields per plant obtained even in the same cultivar could be explained by various
growth conditions, especially the substrate characteristics, nutrient protocols and water
management. The cultivar selection may also make a major contribution to their fitness for
performing well in certain conditions. The cultivars investigated in this work showed a
similar trend in the productivity influenced by both the bio- and chemical fertilizer
applications. This indicates that besides external factors (cultural practices, environmental
factors, etc.), genetic background may have contributed to the similarity recorded in the tested
cultivars.
Fruit Quality Traits
Morphometric Fruit Traits
Since fruit size has been discussed as one of the main components of the yield, a large
size is preferred for the fresh market and improves the hand-harvest efficiency. In the present
study, cv 'Joly' had the largest fruit which is in accordance with the description reported by
Martinelli and Leis (2012). The fruit weight recorded for cv 'Clery' was similar to the
previously published data of Milivojević et al. (2007), although different production systems
were applied in the respective studies.
As regards the effect of bio- and chemical fertilizers on morphometric properties (weight,
length, width and fruit shape index) of strawberry, results revealed a stimulating effect of the
chemical fertilizer. Similarly to our results, Chepiñski et al. (2010) reported that the treatment
with multi-component chemical fertilizers at a rate of 400 kg ha -1 (10% N, 5% P 2 O 5 , 10%
K 2 O) + 30 kg N ha -1 (ammonium nitrate) significantly increased the fruit weight in
strawberries. Contrary to this, in the comparison of the different fertilization treatments
Pešaković et al. (2013) showed that morphometric traits of strawberry fruit (weight, length,
breadth and thickness) were the highest in PGPR 1 treatment consisting of a pure culture of
the Gram-negative diazotrophic nitrogen-fixing bacteria Klebsiella planticola . In the same
study, the application of Multi KMg (12:0:43 + 2MgO) resulted in the lowest fruit shape
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